对于 Maven 存储库凭据，buildscript 中的 Gradle 变量为空答案

【问题标题】：Gradle variable in buildscript is null for Maven repository credentials对于 Maven 存储库凭据，buildscript 中的 Gradle 变量为空
【发布时间】：2019-02-05 22:14:53
【问题描述】：

就上下文而言，我的最终目标是通过环境变量或使用 Maven settings.xml 注入用于构建脚本插件的 Maven 凭据。

我创建了这个 buildscript 闭包来获取凭据：

buildscript {
  ext.nexusCreds = {
    def id = "releases"
    def username = System.getenv("NEXUS_USER")
    def password = System.getenv("NEXUS_PASSWORD")

    if (!(username && password && username.trim() && password.trim())) {
      File mavenSettings = new File("${System.properties['user.home']}/.m2/settings.xml")
      if (mavenSettings.exists()) {
        def xmlSlurper = new XmlSlurper()
        def settings = xmlSlurper.parse(mavenSettings)
        username = settings.servers.children().find { it.id == id }.username
        password = settings.servers.children().find { it.id == id }.password
      }
    }

    println("Username: $username")
    println("Password: $password")
    [username: username, password: password]
  }()
  repositories {
    mavenLocal()
    maven {
      url "http://nexus.ourStagingEnv.com/content/repositories/releases/"
      credentials {
        username nexusCreds.username
        password nexusCreds.password
      }
    }
    jcenter()
    mavenCentral()
  }
  dependencies {
    classpath group: 'com.myPlugin', name: 'myPlugin', version: '1.0.0'
  }
}

问题是，当构建到自定义“maven”闭包时，它似乎认为“username”为空：

A problem occurred evaluating root project 'myProject'.
> Could not find method username() for arguments [deployment] on Credentials [username: null] of type org.gradle.internal.credentials.DefaultPasswordCredentials_Decorated.

请注意，“用户名”和“密码”变量都在“nexusCreds”闭包中打印为非空（我在 settings.xml 中设置了这些）。

这是奇怪的部分：如果我在“nexusCreds”闭包中对这些值进行硬编码，一切正常。

ext.nexusCreds = {
    def id = "releases"
    def username = System.getenv("NEXUS_USER")
    def password = System.getenv("NEXUS_PASSWORD")

    if (!(username && password && username.trim() && password.trim())) {
      File mavenSettings = new File("${System.properties['user.home']}/.m2/settings.xml")
      if (mavenSettings.exists()) {
        def xmlSlurper = new XmlSlurper()
        def settings = xmlSlurper.parse(mavenSettings)
        username = settings.servers.children().find { it.id == id }.username
        password = settings.servers.children().find { it.id == id }.password
      }
    }

    username = "myUsername"
    password = "myPassword"
    println("Username: $username")
    println("Password: $password")
    [username: username, password: password]
  }()

为什么第一个代码块失败了，但硬编码它可以工作？围绕这些闭包的 Groovy 或 Gradle 行为我在这里缺少什么吗？

【问题讨论】：

标签： gradle groovy

【解决方案1】：

哦。发现问题。原来是我的settings.xml解析有问题。用户名和密码是 XML 节点，而不是字符串。解决方法是：

username = settings.servers.children().find { it.id == id }.username.toString()
password = settings.servers.children().find { it.id == id }.password.toString()

【讨论】：